call your area automotive paint stores. if need be you can call the sherwin williams on west st in indianapolis in. i worked there about 13 years ago and we still had the color books from the 40s. i made interior paint all the time. it was usually the same code as the exterior with some flattening agent added. i also pumped it into spray cans so if youre willing to order 12 cans they can put it in aerosol for you. you might even be able to cut a deal and get 9 interior cans and 3 exterior cans for touch up. but, im working on 13 year old knowledge here.